It could be that the video or graphics card has gone bad or got corrupted in some way.If they are bad they have to be replaced if corrupted try to do a repair and see what happens or try a system restore back to before the problem started.

This can be caused by your graphic card,try updating it and if it still isn't working you will have to upgrade your graphic card to a better one or buy the same one you are using at the moment. Could you tell me your pc specs?

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